Materials Literature
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以Ti、B 4 C和Fe粉为原料, 采用等离子束加热反应合成TiB 2 -B 4 C-Fe 3 (C, B)复合材料, 并研究复合材料的物相、组织结构和显微硬度。结果表明: 反应生成物相主要有TiB 2 、B 4 C以及Fe 3 (C, B)。由于等离子束的快速加热、冷却以及散热具有方向性, 板条状TiB 2 晶粒沿散热最快的方向生长, 与白色的Fe 3 (C, B)相间分布, 未反应的B 4 C被挤压在板条之间; 等离子束电流影响单位时间内输入试样的热量, 电流越大越有利于TiB 2 的长大, 但降低复合材料硬度。
采用双层包裹-夹层去除法合成了SiO2-void-TiO2中空核壳微球，通过正十八烷基三甲氧基硅烷对SiO2-void-TiO2微球表面进行部分修饰，制得了双亲性w／o-SiO2-void-TiO2中空核壳微球，并采用XRD、TEM、BET、FT-IR和UV-VisDRS等对样品的晶相结构、形貌、表面结构和吸光性能等进行了表征。以染料亚甲基蓝模拟环境污染物，考察了SiO2-void-TiO2和w／o-SiO2-void-TiO2在紫外光下的光催化性能。结果表明：SiO2-void-TiO2样品呈微球状，具有明显的核-多孔壳结构，在核与多孔壳层之间存在纳米空间层，样品中TiO2核具有锐钛矿结构；w／o-SiO2-void-TiO2样…
We report characteristic field emission (FE) properties of single-walled carbon nanotubes (SWCNTs) synthesized inside the pores as well as on the top surface of a porous silicon (PS) substrate. Turn-on fields and emission current densities were measured and compared with those of other types of SWCNTs in similar envir…
In the present work, we have fabricated organic photovoltaic cells consisting of ITO/PEDOT:PSS/P3HT:PCBM/DMDCNQI/Al using a dip-coating method with various solvent systems. We have investigated solvent effects (such as solubility, viscosity and vapor pressure) in deposition of a thin DMDCNQI buffer layer on the perfor…
Poly(9,9-dioctylfluorene) nanowire arrays with pronounced β-phase were prepared by a one-step fabrication method, liquid-bridge-mediated nanotransfer molding. Liquid-bridge-mediated nanotransfer molding is a new direct nano-patterning method based on the direct transfer of various materials from a mold to a substrate…
Contact resistance between a metal electrode and an organic active layer is one of the most critical issues in the research and development of organic electronic devices. In the present work, we have fabricated vertical type organic light emitting transistor (OLET) using P3HT as a organic active semiconductor and DMDC…
Here we first time reported Dy(3+) and Ce(3+) luminescence in novel Na2ZnSi2O6 phosphors by solution combustion synthesis prepared at 550 °C. Emission spectra of Na2ZnSi2O6:Dy(3+) phosphor was observed at 470 nm and 576 nm keeping excitation wavelength at 350 nm, where as Na2ZnSi2O6:Ce(3+) shows emission band at 452 n…
A series of linear π-conjugated oligothiophenes, α,α'-dihexylquinquethiophene (DH5T), 2,5-bis(5'-hexyl-2,2'-bithiophene-5-yl)thieno[3,2-b]thiophene (DH5TT), and α,α'-dihexylheptathiophene (DH7T), has been synthesized using the Suzuki coupling reaction. The optical and electrochemical properties of oligothiophenes were…
The p-i-n organic light-emitting devices (OLEDs) were fabricated by using a p-type 1,4,5,8,9,11-hexaazatriphenylene hexacarbonitrile (HAT-CN) layer and an n-type bis(ethylenedithio)-tetrathiafulvalene (BEDT-TTF) doped 4,7-diphenyl-1,10-phenanthroline (BPhen) electron transport layer. The p-i-n OLEDs containing a p-typ…
We report an improvement of efficiency in blue phosphorescent organic light-emitting diodes (PHOLEDs) based on triple-emitting layer (T-EML) with mixed host (MH) system using a phosphorescent blue emitter: iridium(III)bis[(4,6-di-fluoropheny)-pyridinato-N,C2]picolinate (Flrpic) doped in N,N'-dicarbazolyl-3,5-benzene (…
Semiconducting copolymers composed of 10-(2'-hexylphenothiazine) (PTZ), 9,9-dioctyl-dithienylfluorene (DTF8), {(2E,2'E)-3,3'-[2,5-bis(octyloxy)-1,4-phenylene]-bis[2-(thiophen-2-yl)acrylonitrile]} (OPTAN), and benzo-[1,2,5]-thiadiazole (BT) units, i.e., poly(PTZ-co-OPTAN-co-BT) and poly(DTF8-co-OPTAN-co-BT), were synth…
We have synthesized and characterized a polyfluorene derivative composed of octyl-substituted thieno[3,2,-b]thiophene and 2,1,3-benzothiadiazole as an acceptor unit. The best power conversion efficiencies of the polymer were showed with 1.63% and 2.31% by using PCBM and PC71BM, respectively.
In this paper, WO3 nanotubes were prepared by a coaxial electrospinning method. Firstly, core-shell structured composite fibers were fabricated via coaxial electrospinning under the optimal electro-spinning parameters to get the best composite fibers with uniform diameters and smooth surface, which pure PVA being the…
2,7-Bis(5-bromo-4-hexylthiophen-2-yl)-9H-fluoren-9-one (DTFO) was synthesized as a new electron-accepting material in semiconducting polymers for use in photovoltaic devices. The synthesized DTFO was polymerized with two different electron-donating counter monomers: 2,7-dibromo-9,9-dioctyl-9H-fluorene (DOF) and 2,6-bi…
A simple and facile method for the patterning of gold nanoparticles (GNPs) was described via selective ion irradiation and oxygen plasma etching. Thin Pluronic films containing HAuCI4 as the precursor of GNPs were selectively irradiated through a pattern mask with 200 keV proton ions to generate GNP-embedded Pluronic…
Dy+3 doped strontium ferrites Sr1-xDyx (ZnZr)0.5 Fe11O19 (x=0, 0.01, 0.02 and 0.03) were prepared by the citrate sol-gel method. The X-ray diffraction (XRD), transmission electron microscopy (TEM), vibrating sample magnetometry, and vector network analyzer were used for phase characterization and microwave absorption…
In the second term of Eq. (1) of this paper, ij = 1 was set in the code by mistake. The correct form is ij = 1. Although the pseudomagnetic field lifts the degeneracy of quantum spin Hall (QSH) edge states, we find it difficult to completely suppress the QSH edge states at one edge of the nanoribbon, as shown in Fig.…
Multi-encoded rugate porous silicon (MRPS)/polystyrene composite films were fabricated by using a free-standing multi-encoded rugate PS and polystyrene. MRPS exhibiting three reflection resonances was generated by an electrochemical etching of silicon wafer using a composite waveform summed three computer-generated ps…
Blue fluorescent materials based on diphenylaminofluorenylstyryl derivatives connected with the various end-capping aromatic groups were synthesized and characterized. An OLED, using (E)-9,9-diethyl-7-(4-(4-fluoronaphthalen-1-yl)styryl)-N,N-diphenyl-9 H-fluoren-2-amine(5) in emitting layer, was fabricated. This device…
The effect of an indium middle layer on the structural, thermal and electrical properties of Ag contacts for high-power GaN-based vertical LEDs was investigated. As the temperature increases, agglomeration is initiated by the formation of hillocks, followed by the generation of holes, leading to agglomeration. The In…